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Tyan Trinity 400 has RAM settings for SDRAM 10ns, 8ns, Normal, Fast, Turbo, and Auto. I think there may be a couple more, but I am at work now and can't check that. I was just curious if anyone had ever messed with similar settings . My guess is there is a very nominal difference. I will benchmark in SiSoft Sandra to compare scores between both settings .

Nuts:
I agree with RAM, you need to bench your memory with Sandra and play around a bit.

I have found that "turbo" is the best BIOS memory speed setting on my Soyo SY6VBA133 (apollo pro 133), probably best on yours as well. Also there are several other BIOS settings which will greatly affect you memory performance. Set you memory interleaving to 4 way - check for the latest BIOS revision if you don't have it available. Also, try WPCREDIT and WPCRSET. Look here:http://viahardware.com/memtweakguide1.htm

After I tweaked my BIOS registries with this, my Sandra memory scores increased by 50% an my SETI WU times dropped by 40%

I have the latest BIOS 1.07 which supposedly enables 4-way interleaving, but there is no setting I can tinker with(at least that I know of) I have dabbled a little with those HOda proggies, but didn't notice much of a difference. Back to tweakin'!!

Looks like even with the PC133 CAS2 overclocked to 149, I only score about 20/50 better than you with PC100@140 CAS3. But I really haven't tweaked up this new board yet. The jump from Apollo Pro (w/ major tweaks) to Apollo ProA (w/ only minor tweaks so far) was good for a 60/110 jump in my memory scores. I'm happy. I'll let it crunch some SETI tonight and se how that does. I havent run any 3dmark scores yet, but its not comparable for you since I have a GTS2 and with the other mb scored in the 6500 range.